JPS61256185A - Base for baking tile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bed that is placed on a trolley passing through a firing furnace to place a molded base for accessory tiles during tile firing. It is.

[Conventional technology]

FIG. 9 is a partial vertical sectional view of the thread kiln 1, which is an example of a firing furnace. As shown in the same figure, the thread kiln 1 is constructed so that the cart 3 can slide on the guide rail 2.2 that is laid through the kiln (not shown). It consists of a base plate 9 placed on the rail 2゜2 via a slide plate 4.4, and fireproof insulation bricks 5 laid out on the base plate 9. The firing of tiles in this thread kiln 1 When the tiles are ordinary flat tiles 6, the flat tiles 6 are placed directly on the fireproof insulation bricks 5 and passed through the furnace. 7, a bed 8 is placed on the fireproof insulating brick 5, and the accessory tile 7 is placed on the bed 8 and passed through the furnace. This is because if the tile 7 is placed directly on the fireproof insulation brick 5 and fired, it will soften during firing and deform due to its own weight.

The base 8 is usually manufactured by forming a powder of a heat-resistant raw material whose main component is one or a mixture of two or more of silicon carbide, silicon nitride, alumina, etc. into a plate shape and firing it at a high temperature. There is. In addition, there are special types in which a material such as copierite or mullite is formed into a plate shape and fired at high temperature, or a mixture mainly composed of heat-resistant inorganic fibers is simply formed into a plate shape.

[Problem that the invention seeks to solve]

However, products whose main ingredients are silicon carbide, silicon nitride, alumina, etc. or a mixture of two or more of them cannot be said to have excellent heat resistance, and have the disadvantage of cracking during firing and short lifespan. was there. Additionally, those manufactured using copillite or mullite materials have the disadvantage that the base made of these materials absorbs the heat for firing the tiles, making it impossible to fire the accessory tiles. Furthermore, in cases where the base 8 is made of a mixture mainly composed of heat-resistant inorganic fibers, the front surface of the base 8 is vitrified, but the degree of vitrification on the back surface is small, so that the front surface 8a side and the back surface 8b side are The degree of thermal expansion and contraction is large (differently, large deformations such as warping occur, and this affects the accessory tile 7 in a softened state, causing the accessory tile 7 to
This has the disadvantage that it causes deformation such as warping.

Further, in the conventional pedestal 8, since its upper surface 8a is flat, it comes into close contact with the back surface 7b of the accessory tile 7, and there is a problem in that firing heat is difficult to be transmitted to the back surface 7b. For this reason, the firing temperature between the front surface 7a and the back surface 7b of the accessory tile 7 was uneven, causing uneven firing. The uneven firing causes the accessory tile 7 to be warped or otherwise deformed.

In short, the conventional platform 8 has problems of deformation due to its own thermal expansion and contraction during firing, and the surfaces 7a and 7 of the accessory tile 7.
There was a problem that the firing caused unevenness between the tile 7 and the tile b, and there was a drawback that the accessory tile 7 was deformed due to warping or the like.

The present invention has been developed to improve and eliminate the above-mentioned drawbacks of the conventional pedestal, and it is possible to make the firing temperature uniform between the front and back surfaces of the accessory tile, and to avoid deformation of the pedestal itself. We are trying to provide what we don't have.

[Means for solving problems]

A means for solving the problems of the present invention is to provide a plurality of irregularities on at least one surface of a base used for placing a molded base of accessory tiles during tile firing.

[For production]

As is clear from the embodiments shown in Figs. The thermal expansion/contraction that occurs causes unevenness 1 including grooves 11 and convex portions 12.
3 to prevent deformation such as warpage of the base 10. Furthermore, due to these unevenness 13, the concave portion 1 between the convex portions 12
4 and the groove 11, the firing heat is efficiently transferred to the back surface 15b side of the accessory tile 15, and the surface 15 of the accessory tile 15 is
It is possible to uniformly bake both a and the back surface 15b. Therefore, the firing of the accessory tile 15 itself is uniform, and there is no deformation such as warping caused by this.

The configuration of the present invention will be explained below based on the embodiments shown in the drawings.

〔Example〕

1 to 6 show an embodiment in which grooves 11 are formed on the surface 10a (11) of the base 10 to form unevenness 13. As shown in FIG. 1, in this case, the short side Four grooves 11 are formed parallel to the direction.The method of using this base 10 is as shown in FIG. There is no change. Therefore, when the base 10 in the state shown in FIG. Since it is exposed to the internal atmosphere and the back surface 10b side is joined to the fireproof insulation brick 5, a temperature difference occurs between the front surface 10a side and the back surface 10b side.

For this reason, the front surface 10a Ill contracts more than the back surface tab side and tends to deform. However, in the main stand 10, the shrinkage on the surface 10a side is separated by the valley grooves 11, and furthermore, as shown in FIG. 3, the spacing between the valley grooves 11 is increased to absorb and alleviate the shrinkage. It becomes like this. Therefore, the degree of shrinkage of the entire surface 10a side of the base 10 is significantly reduced compared to the conventional case,
The flatness of the surface 10a is almost unchanged.In other words, with this base 10, it is possible to prevent the base 10 itself from being deformed during firing, and it is possible to prevent warping or the like on the softened accessory tile 15. Does not cause deformation.

Further, as shown in FIG. 4, the groove 11 acts as a passageway that directly guides the atmosphere in the furnace toward the back surface 15b of the accessory tile 15, thereby making the firing temperature uniform on the tile surfaces 15a and 15b during firing. In other words, the surface 15a of the accessory tile 15
It is possible to prevent uneven firing between the side and the back surface 15b side.

Furthermore, in this embodiment, the depth h of the groove 11 is limited as follows, so that the effects of the political situation 11 can be maximized. In other words, the depth h of the political situation 11
is in the range of 5 to 70% of the height H of the base 10,
Preferably it is in the range of 25 to 40%. If it is less than 5%, the direct objective of the present invention is to prevent deformation of the base 10 itself due to thermal expansion and contraction during firing and to prevent uneven firing temperature between the front surface 15a and the back surface 15b of the accessory tile 15. This is because the effect of eliminating it cannot be obtained. Moreover, if the ratio of the depth h exceeds 70%, the strength of the base 10 itself will be weakened, and chips, cracks, etc. will occur.

By the way, there is no need to limit the raw material for the base 10 of this embodiment, and conventional materials containing one or a mixture of two or more of silicon carbide, silicon nitride, alumina, etc. as main components, cordierite, It may be made from a mullite material as a raw material, or may be molded from a mixture mainly composed of heat-resistant inorganic fibers. In this embodiment, in order to make the firing temperature of the back surface 15b of the accessory tile as equal as possible to the firing temperature of the front surface 15a, the raw material of the accessory tile 15 is selected as follows to improve the heat conduction itself. Improving. That is, it is made mainly of heat-resistant inorganic fibers and an inorganic binder, and its bulk density is kept low to make it porous. The range of bulk density is 0
．． 2 to 0.5 g/aJ is suitable. Ceramic fiber is a heat-resistant inorganic fiber.

Silica fiber, alumina, mullite crystalline fiber, etc. are suitable, and at least one of them is used. As the inorganic binder, commonly used ones such as silica sol, alumina sol, benthite, kaolin, and montmorillonite can be used.

The reason why the bulk density is limited is that if it is less than 0.2 g/cd, the strength of the base 10 itself will be weakened and it will not be able to withstand use as a base for placing relatively heavy tiles. Also, if the bulk density exceeds 0.5 g/d,
The weight of the product itself becomes too heavy, making it inconvenient to handle.
Furthermore, the amount of heat stored in the bed 10 itself is large (and the thermal efficiency is poor).

When the bulk density is within the above range, the base 10 has excellent strength and thermal efficiency, and is convenient to handle. In addition, it is porous and allows good heat to pass through. As a result, during firing, heat passes from the base 10 to the back surface 15b of the accessory tile 15, and the firing temperature of the front and back surfaces of the tile is reduced. It works to make it as uniform as possible.

In this way, in this example,! 111 prevents deformation of the base 10 itself, and also prevents the accessory tile 150 from deforming.
By making the firing temperature as uniform as possible on the front and back surfaces, it is possible to prevent deformation of the tile itself due to uneven firing. By limiting the material and bulk density of the base 10 and the size of the grooves 11, the above-mentioned effects can be maximized.

By the way, the shape of the groove 11 is not limited to the above-mentioned embodiment, and may have the shape shown in FIGS. 5 and 6. A plan view of the base 10 showing the different shapes of the grooves 11, FIG.
al to figures (hl are side views of the bed 10 corresponding to figures (al to figure N) in FIG. 5. Other configurations and grooves 1
The effects of the modified embodiment in which the depth h is limited to 1, the basic embodiment in which the material is not limited, the modified embodiment in which the material is limited to 1, etc. are the same as in the above embodiments.

Next, the figures in Figure 7 (al to figure (C) and figure t in Figure 8)
An example in which a convex portion 12 is formed on the surface of the bed and the surface of the bed is made uneven 13 will be explained with reference to figures a+ (C1).
The figures (al to figure (C1) in the figure are plan views showing the bases 10 with different convex shapes, respectively, and the figures (δi to figure (C1) in FIG. 7 is a side view of a corresponding bed 10. In the embodiment shown in FIG. 7 (a) and FIG. A recess 14 is formed between the rows of parts.
In the embodiment shown in FIG. 1, protrusions 12 are provided on the surface 10a of the base 10, and recesses 4 are formed between each protrusions 2.

Further, in the embodiment shown in FIG. 7 (C1 and FIG. 8 fc), the unevenness 13 is formed by providing sawtooth-like protrusions 12 and recesses 14 over the entire width in the short side direction. In each of these embodiments, each of the convex portions 12 corresponds to the base 1 during firing.
0 from being deformed, and the furnace atmosphere directly contacts the back side of the accessory tile 15 from each recess 14 by convection or the like.
Improving the passage of heat is the same as in the embodiment described above. Therefore, the explanation here will be omitted.

By the way, the present invention is not limited to the above-mentioned embodiments, and can be modified as appropriate. For example, the grooves 11 and the protrusions 12 may be formed on the side and back surfaces of the base 10 within the range permitted by the strength of the base 10. You may.

〔Effect of the invention〕

As explained above, in the present invention, by forming irregularities on the surface of the base, the difference in thermal expansion and contraction between the front and back surfaces of the base during firing can be absorbed and alleviated, thereby preventing deformation such as warping. be able to. Therefore, there is no adverse effect such as deformation of the accessory tile by the base. In addition, the atmosphere inside the furnace is introduced to the back side of the accessory tile through the recess on the surface of the base, and the back side of the accessory tile can be heated and fired through the heat conduction of the furnace atmosphere introduced into the recess and the base itself. It is possible to make the firing temperature on the front and back surfaces of the tile as uniform as possible. Therefore, there is no unevenness in firing, and accessory tiles of excellent quality can be fired.

[Brief explanation of drawings]

Figures F to 8 relate to the present invention; Figure 1 is a perspective view showing a base with grooves formed thereon, and Figure 2 is a perspective view showing a state in which accessory tiles are placed on the base. Figure 3 is a side view showing thermal deformation of the base during firing, Figure 4 is a perspective view showing the state in which the atmosphere inside the furnace is introduced into the back side of the accessory tile through the groove, and Figure 5. Figures (Al to Figures) (Each is a plan view of the base showing an example in which the shape of the groove is modified, and Figures + Al to Figures in Figure 6 correspond to Figures fa+ to Figure (h) in Figure 5. Figures (a) to (C1) are a plan view of the base showing a modified example in which a convex portion is formed, and figures (al to (C) are A side view of the pedestal corresponding to figures (a) to tc+ in Fig. 7, and Fig. 9 is a vertical cross-sectional view of the thread kiln.
Groove 12...Protrusion 13...Irregularity
14...Concave patent applicant Inax Co., Ltd. Representative Patent attorney Toshihiko Uchida Figures 1 and 4

Claims (1)

[Claims] 1. A base for tile firing, which is used for placing a molded base of accessory tiles during tile firing, and is characterized by having a plurality of irregularities on at least one surface.